Reinforcing-bar.



UNITED STATES PATENT OFFICE.

ALFRED n. LINDA 1:, or sr. LOUIS, mssorui, assicnon TO CORRUGATED BAR COMPANY or sr. LUIIIS, MISSOURI, A CORPORATION-OF Missouri.

nEmroncmo-BAR.

Specification of Letters Patent.

Patented Aug. 1?, 1-909.

Application filed December 6, 1907. Serial No. 405,888.

To all whom it may concern.-

. Be it known thatl, Ammo. E. LINDAU, a citizen of the United States, residing at St. Louis, Missouri, have invented a certain new and useful Im rovement in Reinforcing- Ba-rs, of whicht 0 following is a full, clear, and exact descriptiomsuch as will enable others skilled in the art to which it appertains to make and use the some, reference being had to the accompanying drawings, forming part of this s eclfimtion, in which Figure 1 is a side e evation of a reinforcing bar constructed in accordance with my invention; Fl 2 is a cross sectional view of said bar to en on the line 2--2' of Fig. 1 and looking in the direction indicated by the arrow; Fig. 3 is a cross sectional view taken on the line 3-3 of Fig. 1; Fi 4 is a side elevation of a bar of different s ape in cross section from that shown'in Fig. 1; Fig. 5 is a cross sectional View taken on the line 5--5 of Fig. 4; Fig. 6 is a side velevation of a slightly modified form of my invention Fig. 7 is across sectional view taken on the hue 7-7 of Fig. 6; Fig. 8 18 a side elevation of another form of my invention; and

' or projections on each Fig. 9 is a View similar to Fig. 4 of still another form of my invention.

This invention relates to reinforcing. bars such as are used in concrete constructions for the purpose of strengthening same.

The main object of my invention is to provide a ribbed reinforcing bar that is of constant normal cross section throughout its entire length. To this end I have designed a metallic reinforcing bar that is provided on its exterior with ribs or projections which are so arranged that it will be impossible to sever the burnt any point without severing an equal number of ribs side of the bar, thereby producing a bar in which there is an equal amount of material in each half of the bar. The ribs preferably extend diagonally of the longitudinal axis of the bar, and onehalf of the ribs on each face or side of the bar are inclined oppositely to the other ribs on said side or face. The barmay be of any preferred shape in cross section and when a bar of non-circular shape in cross section is used each face of the bar may be provided with a set of ribs or each set of ent shape in cross section and provided with ribs that are inclined at diil'erent angles but it should be understood that my invention is not limited to the constructions herein shown as the cross sectional shape of the bar and the angle at which the ribs are inclinedis immaterial so far as my broad idea is concerned; It is referable, howevcr,- to so arsaid ribs that their faces are inclined ran e 'to tl ie axis of the bar by an amount less than the angle of friction.

In Fig. l of the drawings I have shown a bar 1 ofhexagona-l shape in cross section provided on its two sideswith sets of oppositely inclined diagonal ribs 2 that form a continuous bonding member, the ribs of each set extending across three faces of the bar and merging into fillets3 that connect the ends of the oppositely inclined ribs of each set. The bar is i also provided with two longitudinally extending heads 4: arranged at approximately the center of the barand the ribs of each set extend continuously from the bead 9. at one edge of the bar to the bead l at the opposite edge of the bar, It will be ribs on one half or side of the bar are disposed oppositely to the ribs on the other hult' or side of the bar so that the bar will be balanced perfectly. That is to say, any particle of metal on a diameter is balanced by a symmetrical particle on the opposite half of the diameter. it is not absolutelynecessary, however. that ,the sets of ribs on each half of the bar be arranged in alinement with each other for the bar would be just as strong it the set of ribs on one half of the bar were offset relatively to the set of ribs on the other halt of the bar.

By arranging the ribs in the manner shown in Fig. 1 I produce a bar of constant normal cross section throughout its entire length for the same number of ribs on each I concrete in which it is embedded.

ing faces in the concrete, thereoy producing a substantial bond between the bar and the Another advantage of a reinforcing bar of this'con- .struction is that it has no tendency to turn or rotate in the concrete for the ribs on onehalf of each face or half of the bar are disposed oppositely to those on the same face or half :of the bar. The bar shown in Fig. 4: is of substantially the same construction as that shown in Fig. 1 except that the bar is square in cross section, the set of oppositely inclined diagonal ribs 2 on each half of the bar extending over two faces of the bar.

Fig. 6 shows a bar that is of approximately diamondshape in cross section and the oppositely inclined diagonal ribs 2 on said bar merge mto each other and haveshort fillets 3 interposed between their meetingv ends.

Fig. 8 shows a square bar provided on itsfour corners with beads 4 and having a set of oppositely inclined diagonal ribs 2 extending over each face of the bar, the ends of the ribs merging into said beads and also being connected together by short fillets 3. As shown in dotted lines in saidfigure, the ribs on one half or side of the bar are offset relatively to the ribs on the other half of the bar. While I have herein shown the ribs on each half or side of the bar arranged at the same angle it will, of course, be obvious that the ribs on one half of the bar could be arranged at a different angle from those on the other half of the bar without departing from the spirit of my invention. In such a construction, however, it would be necessary to thicken the ribs of the greatest inclination to compensate for the increase in area cut by the normal plane as the an 'lebetween the diagonal rib and the norma plane decreases.

I also desire to have it understood that in my improved bar the ribs on one half of the bar do not form a continuation of the ribs on the other half of the bar; such for example, as would be produced if the bar were provided with a long spirally wound rib. Furthermore. it is not necessary that each face of the bar be provided with the same number of ribs. In Fig. 9 for example I have shown a square bar in which each half provided with a set of long oppositely inclined diagonal ribs extending over two faces of the bar and a set of short oppositely inclined diagonal ribs extending over one face of the bar and arranged between the long ribs.

I prefer to form ribs on each face of the 5 1. A metallic reinforcing bar for concrete structures provided with a plurality of longitudinally extending zig-zag ribs that lie ,on opposite sides of, the bar, said ribs being staggered relatively to each other so that the I inclined portions of 'one of said zig-zagribs lie intermediate theinclined portions of the other zig-zag rib instead of in transverse alinement therewith; substantially as described.

2. A reinforcing member for concrete structures consisting of a metalbar provided with longitudinally extending beads, and long zig-zag ribs on opposite sides of the bar, each of said long zig-zag ribs being located between two of'the longitudinally extending beads and the zigzag rib on one side of the bar being arranged staggered relatively to the other zig-zag rib; substantially as described.

' 3. A metallic reinforcing bar for concrete structures provided with aplurality of longitudinally extending beads that divide the surface of the bar into independent sections 01' faces, a long zigzag-rib extending longitudinally of the bar on each of said faces between two of said beads, and fillets connecting the ends of the inclined portions of said ribs together, the zig-zagrib on one face of the bar being staggered relatively to the zigzag rib on the opposite face of the bar; substantially asdescribed.

I. A reinforcing member for concrete structures, consisting of a metal bar provided with longitudinally extending beads that divide the surface of the bar into independent sections or faces, and a long zigzag rib on each face of the bar arranged betweensaid longitudinal beads, the zigzag rib on one face of the bar lying substantially midway and parallel to the zigzag rib on the other face so that said ribs are entirely removed from each other; substantially as described.

In testimony whereof I hereunto affix my signature in the presence of two witnesses, this fourth day of December 1907. 

